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Astron. Astrophys. 363, 476-492 (2000)

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Photometric redshifts based on standard SED fitting procedures

M. Bolzonella 1,2,3, J.-M. Miralles 4 and R. Pelló 3

1 Istituto di Fisica Cosmica "G. Occhialini", via Bassini 15, 20133 Milano, Italy
2 Università degli Studi di Milano, Dipartimento di Fisica, via Celoria 16, 20133 Milano, Italy
3 Observatoire Midi-Pyrénées, UMR 5572, 14 Avenue E. Belin, 31400 Toulouse, France
4 Tohoku University, Astronomical Institute, Aramaki, Aoba-ku, Sendai 980-8578, Japan

Received 27 March 2000 / Accepted 3 October 2000


In this paper we study the accuracy of photometric redshifts computed through a standard SED fitting procedure, where SEDs are obtained from broad-band photometry. We present our public code hyperz , which is presently available on the web. We introduce the method and we discuss the expected influence of the different observational conditions and theoretical assumptions. In particular, the set of templates used in the minimization procedure (age, metallicity, reddening, absorption in the Lyman forest,...) is studied in detail, through both real and simulated data. The expected accuracy of photometric redshifts, as well as the fraction of catastrophic identifications and wrong detections, is given as a function of the redshift range, the set of filters considered, and the photometric accuracy. Special attention is paid to the results expected from real data.

Key words: galaxies: distances and redshifts – galaxies: general – methods: data analysis – techniques: photometric

Send offprint requests to: M. Bolzonella (micol@ifctr.mi.cnr.it; mbolzone@ast.obs-mip.fr)

© European Southern Observatory (ESO) 2000

Online publication: December 11, 2000